text: const AirportsRepository = require('../repositories').AirportsRepository;
  const DestinationsRepository =  require('../repositories').DestinationsRepository;
  const DealsRepository = require('../repositories').DealsRepository;
  const BookRepository = require('../repositories').BookRepository;
  const FlightsRepository = require('../repositories').FlightsRepository;
  
  const _PriceService = require('./price.service');
  const _NavbarService = require('./navbar.service');
  const _AirportsService = require('./airports.service');
  const _DateService = require('./date.service');
  const _BookFormService = require('./book.form.service');
  const _BookService = require('./book.service');
  const _DealsService = require('./deals.service');
  const _FlightsService = require('./flights.service');
  
  const PriceService = () => new _PriceService();
  const NavbarService = () => new _NavbarService();
  const AirportsService = () => new _AirportsService(AirportsRepository());
  const DateService = () => new _DateService(PriceService());
  const BookFormService = () => new _BookFormService(AirportsService());
  const BookService = () => new _BookService(BookRepository(), AirportsService());
  const DealsService = () => new _DealsService(DestinationsRepository(), DealsRepository(), AirportsService());
  const FlightsService = () => new _FlightsService(FlightsRepository(), AirportsService(), PriceService());
  
  module.exports = {
      PriceService,
      NavbarService,
      AirportsService,
      DateService,
      BookFormService,
      BookService,
      DealsService,
      FlightsService
  };